"But the element also has common industrial uses, including in pesticides and wood preservatives. And according to the Environmental Protection Agency, inorganic arsenic (meaning simply a form of arsenic that has not bonded with carbon) has been shown to persist in the soil for more than 45 years.
Because of this, even dangerous arsenic-containing insecticides that are no longer in use, such as the lead-arsenate insecticides banned in the '80s, may continue to be absorbed by crops grown on contaminated soil for decades."

"According to Consumer Reports, a 2010 study from the EPA said that vegetables account for the biggest dietary exposure to arsenic, accounting for 24 percent of intake. Fruits and fruit juices follow, with 18 percent, and rice accounts for 17 percent."